Collapsible taper-thread tap and reamer.



1%. 894,863. PATENTED AUG. 4, 1-908. W. VOSPER.

GOLLAPSIBLE TAPER THREAD TAP AND REAMER.

APPLICATION II'LED NOV. 2, 1907.

- 2 SHEETS-SHEET 1.

xa Y M% No. 894,863. PATENTBD AUG. 4, 1908.

' W. W. V'OSPER.

GOLLAPSIB-LE TAPER THREAD TAB AND REAMER. APPLICATION FILED NOV. 2,' 1907.

2 SHEETS-SHEET 2.

* ii wi l 5 m i M HI 1 24 {I H 76 WITNESSES; I v wmvgyrworx.

' citizen of the United States, and-1a resident -To all whom it may concern:

" UNITED "STATES PATENT OFFICE;

WILLIAM w. vosPER, or TOLEDO, 01-110 Assleno'n :ro THE-SHAWJ-{ENDALL ENGINEERING COMPANY,"QF vroLEno," 01110, A conrona'rioN or 'o rno.

' Q cornarsnann ,TAPER-THREAD Tar AND Rnamna;

Specification of Letters Pat ent.

, 'Patented Aug. 4, 190a.

' Application filed November 2, 190': Serial no. 400;;01.v Y

Be it known that 1, WILLIAM WJVosPE'R, a

of Toledo, in the county of Lucas andState' of Ohio, have invented a certain new and useful Collapsible Taper:- Thre'ad Ta and Reamer; and I do herebydec'lare' the dd ing to be a full, clear, and exact description ,of the invention, such as will enable others skllled 1n the art to Which-it appertains to" makeand use the same, referencebeing? had to the accompanying drawings, and to the figures of reference "mark ed thereon, which form a :part'of this specification.

plan "view ofthe "a paratus. V Figs. 4" and 5 v My invention relates to apparatus for use inconjunction with boring mills, drillpresses, .or -the like, for thetapping andreaming of metal flanges: or other articles; and it has for its object the provision 'of a simple and highly eflicient tool of this class,:

which is collapsible i in its naturef and -in which chasers o'r diesfor'difierent sizes of work are inte changeable and automaticall operative to cut a taper th The operation; construction and "arrange ment of the parts ofythe 'inventionareiully described in the following specification, and

illustrated in the drawings,

in which,'

Figure 1 is a central section of the apparatus embodying my invention.

Fig. 2 1s a transverse'section taken on the,

dotted line in Figl 1." iiFig.3 is a bottom are sideand'bottoin end views of thetapered 'chaser-coactingfplug, 6 is aside elevation of the apparatus with an extension chaser-bracing rmgshown in section thereon, and Fig. 7is a*top"plan view ofsaid ring removed from the apparatus Chasers in P i theri c 7 Referring to iilfi, '1 designates the chaser or die carryinglhead ofltheapparatus,

which has its upperportion oontracted or' fashioned to forni a stern 2: for {attaching "to oring-ihill or drill-press spindle or f other carrying part orthe niach1ne; ;with

which it'is to be associat'edjby a-seflserewor inanyother convenientfi'iaQnher.

the usualb or enlarged. endthereof fidform the receive at itsouter.-end"thej plug which has its outwar .:moven entnelative*toflthe head influenced by the action of "said-spr ng;

llowso asto ment of'the head 1' and; by'the lower end of the p I continued movement of The heail l I and lts stem are-axiallyhored froni'thefllgwer I eta?v for the coiled compression-spring and" to:

, Formed in the face or'lower end'of the head 1 are a plurality of grooves 6, which radiate 'fromthe socket 3 and form ways for the reception of the ,radiallymovable v( --hasejrsf -orl e0,

dies'7. These chasers are supportedwithin said ways by the bottom ring 8, which is socured to the head by screws'8, forinany I Totherfsui-table manner. 'The inner ends'ofj the chasers 7 seat in'registeringgrooves'or races 9 provided longitudinally-in the outer end portionof the plug 5, as shown, said same, is to provide stock for abutting against the wall of the socket 3 between the points of engagement of theichasers withthe' plug ositively center the chaser-engaging end of t e plug withinfthfiocket. This has has been found in ractice to bean-important feature. There ative longitudinal move- 12 of the press. when the head has been-lowered in contiguous "osition to the work and maintaining such ed piosition' during 'the through the work.

13'3clesignates a sto '-screw which is carried at the lower end of t e lug 5 and is adjustable in the plug as the" epth of'the work 0 diameter of the thread may require.

In order to provide 'sim' 'le meansfor, si

multaneously throwing o'utt echasers 7 after plug 5 is occasioned u'g striking the bed e head and Chasers an operation, eaelifchaseris provided on its the associated chaser groove 9 and into aregis'teringfearnrecess'16 rovided in the lower end ofthe sleeve 17. his-sleeveis journaled for rotary movement onthe contracted porrojectionjm, which pro- -tion ofthe headf'l Withits lower'end seating on theshoulder-l' ofthe head audits u per end"abuttingagainsfia'collar 18, whic is threaded to the head,.-.asshown. A handle IQ' -pro'jects fromthe sleeve 17 to facilitate a be possible.

used. I wish it' understood that while .I have head it is retained in such position by the coacting of the chasers with its. tapered surfaces until the sleeve 17 has been turned in 'theproper direction for the cam-recesses 16 to act on the pins 14- to throw the chasers out.

Referring to Figs. 6 and 7, 20 designates a head extensionring, which is intended to brace the projected chaser-ends and to adapt the apparatus for operating on a greater range of sizes of work than would otherwise This ring is intended to fit closely around the enlarged or chaser carrying part of the head 1 and has the upper portion! of its inner surface annularly recessed,

as-at 21 to adapt it to seat over-the shouldered portion 1 of the head, periphery, as shown,- thus limiting the inward or u wardmovement of the ring-on the head. T e under side of the ring is radiall recessed or grooved, as at .22, to provide 0 aser-ways-in register with those in the head. A key 23 is positioned in registering seats 24 in the head and ring to lock the same against relative rotation. As 'the working strain is u ward on the,chasers it is apparent that tl fe latter need only be braced on the tops or upper sides thereof, as shown.

' The chasers or dies 7 are shown as having their ends formed with lower reaming surfaces 7*- and up er thread cutting surfaces. 7", thus making 1t possible both to ream and thread the work at a single operation.

, M It is apparent that I have provided a very strong and hi hly efficient apparatus of the class described, which is easy and simple of operation and is cafpable of adjustment for a very large range 0 sizes of work, as the extension-rings 20may be made in different sizes to suit the different lengths of chasers shown and described a articular construction and arrangement of the parts of my invention, I do not desire to be restricted to such construction or arrangement, as obvious modifications will occur to persons skilled in the art.

Having thus described my invent on, what I claim as new and'desire to secure by Letters Patent,'is,

1. In combination, an axially socketed head, tapping dies radially movable therein, means mounted for axial movement within the head socket and adapted when moved inwardly therein to permlt a retraction of the dies, means influencing an outward movement of said first means, and rotary means carried by the head and acting on the dies independently of said first means to effect a positive radial movement to the dies when the head and said rotary means are relatively turned.

2. In combination, an axially socketed inner ends of the dies to head, tap ing, dies radially movable therein, a plug yie dingly mounted in said socket and having a tapered portion coacting with the ermit them to gradually retract when the p ug is moved inwardly, and a sleeve rotatably carried by the head and acting on the dies inde endently of the plug to cause an outwar movement thereof when the sleeve is rotated in one direction relative to the head.

3. In combination, an axially socketed head, chasers mountedfor radial movement in said head, a plug movable in said socket and having tapered longitudinally extending chaser-coacting surfaces whereby a relative movement of the plug and head in one direction ermits an inward radial movement of the ciasers, a sleeve journaled on the head and having cam-recesses in one end, pins projecting laterally from the chasers and -working in said recesses whereby a rotary movement of the sleeve effects a ositive radial movement of the chasers, an means for influencing an outward movement of the ln f p 4% In combination, a head having radial chaser-ways therein and formed with a contracted'axial extension forming a stem, said head and its stem being axially socketed, a

plug yieldingly mounted in said socket and provided longitudinallywith tapered chaserengaging surfaces, chasers mounted for radial movement in said ways and having lateral projections, a sleeve journaled on the contracted portion of the head and having an end abutting against the shoulder formed by the head proper, said sleeve end having camrecesses for receiving the chaser projections, and a sto -screw threaded in the outer end of the lug or contact with an 'alining object to hold the lug stationary to permit the head to move own thereon.

5, The combination with a tap inghead having a peripheral shoulder, and t 1e chasers carried by the head, of an. extension-ring removably encompassing the head and having an inner recess for receiving the shoulder and radial grooves for receiving the projected chaser-ends, the shoulder and chasers acting in opposition on the ring to retain it in position on the head.

6.- The combination with a tapping-head, and radial tapping dies carried thereby, of an extension ring removabl encompassing the head and combining with. the head to brace the ends ofthe dies which project beyond the head.

In testimony whereof I have hereunto signed my name to this specification in the presence of two subscribing witnesses.

iWILLIAM W. VOSPER.

Witnesses (I WJOWEN, HAZEL B. HIETT. 

